Determine whether or not the following expressions are valid, i.e., whether the left- and right-hand sides represent

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Determine whether or not the following expressions are valid, i.e., whether the left- and right-hand sides represent the same function.
(a) x1x3 + x1x2x+ x1x+ x1x= x2x+ x1x3 + x2x+ x1x2x3
(b) x1x+ x2x+ x2x= (x+ x+ x3)(x+ x+ x3)(x+ x+ x3)
(c) (x+ x3)(x+ x+ x3)(x+ x2) = (x+ x2)(x2 + x3)(x+ x3)

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